John, how did it go? I just got my own ridgerest solar in the mail today, and after examining it, it looks like the aluminum layer isn't so much glued on, but rather "heat-shrinked" on. Specifically, it looks like it's only truly sealed/glued on at the pad's edges. I want to trim my down as well, but i'm worried that taking some scissors to it, will cause the aluminum layer to peel off or not stick to the foam, since I'd be cutting off what I perceive to be connection between the foam and the aluminum.
Did you end up cutting it up? and did the aluminum stick or peel at your cut edges?
I'll call cascade designs to get their opinion, but some real world experience would be appreciated.